Bug 451066

Summary: VSync is forced in Plasma Wayland session with disabled in-game VSync [NVIDIA].
Product: [Plasma] kwin Reporter: Samuel <sampingu02>
Component: wayland-genericAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: normal CC: xaver.hugl
Priority: NOR    
Version First Reported In: 5.24.2   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Samuel 2022-03-03 05:49:18 UTC 
SUMMARY
When the in-game VSync is disabled, KWin forces VSync but while in GNOME Wayland session, this doesnt happen.


STEPS TO REPRODUCE
1. Open a Game which has option to disable in-game VSync.
2. Go to settings and disable VSync.
3. Check the FPS using Mangohud or DXVK HUD. The FPS is still capped to display refresh rate.

OBSERVED RESULT
Here is the video showcasing this VSync forced by KWin and compared to GNOME Wayland session:- https://www.youtube.com/watch?v=mATihNvCizY . You can clearly see that the FPS is capped in Plasma Wayland session while its uncapped in GNOME Wayland session with the same in-game settings (VSync disabled).

EXPECTED RESULT
The FPS should be uncapped like in the GNOME Wayland session when in-game VSync is disabled.

SOFTWARE/OS VERSIONS
Linux Kernel: 5.16.11
KDE Plasma Version: 5.24.2
KDE Frameworks Version: 5.91
Qt Version: 5.15.2

ADDITIONAL INFORMATION
NVIDIA Proprietary Driver 510.54
YouTube Video showcasing the issue:- https://www.youtube.com/watch?v=mATihNvCizY
Comment 1 Zamundaaa 2022-03-09 20:15:56 UTC 

*** This bug has been marked as a duplicate of bug 450914 ***